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} } } Notice that the validation logic uses the overloaded version of the DecimalParse() method that accepts a value from the NumberStyles enumeration That s because validation is always performed before conversion If you ve applied both the validator and the converter to the same field, you need to make sure that your validation will succeed if there s a currency symbol present The success or failure of the validation logic is indicated by returning a ValidationResult object The IsValid property indicates whether the validation succeeded, and if it didn t, the ErrorContent property provides an object that describes the problem In this example, the error content is set to a string that will be displayed in the user interface, which is the most common approach Once you ve perfected your validation rule, you re ready to attach it to an element by adding it to the Binding.

ValidationRules collection Here s an example that uses the PositivePriceRule and sets the Maximum at 99999: <TextBlock Margin="7" GridRow="2">Unit Cost:</TextBlock> <TextBox Margin="5" GridRow="2" GridColumn="1"> <TextBoxText> <Binding Path="UnitCost"> <BindingValidationRules> <local:PositivePriceRule Max="99999" /> </BindingValidationRules> </Binding> </TextBoxText> </TextBox> Often, you ll define a separate validation rule object for each element that uses the same type of rule That s because you might want to adjust the validation properties (such as the minimum and maximum in the PositivePriceRule) separately If you know that you want to use exactly the same validation rule for more than one binding, you can define the validation rule as a resource and simply point to it in each binding using the StaticResource markup extension As you ve probably gathered, the BindingValidationRules collection can take an unlimited number of rules.

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The term experience here is synonymous with what social engineers refer to as a ceremony. Most people use the term ceremony in conjunction with a wedding, but here I m talking about a known interaction pattern. Weddings surely fall into this category, as do a number of more regularly occurring events. When you pass through security at the airport, you will provide your ticket and a form of identity to the employee routing people through the queue. When entering a different country, there is a ceremony where you provide your passport. This ceremony is pretty consistent in most countries in the world. With the large number of travelers crossing borders every day, the consistency of this ceremony helps the system run smoothly, with clear, consistent interactions. The request for and providing of identity tokens in the metasystem is a similar ceremony. If you re using Internet Explorer, Firefox, or the Safari browser, your experience should be the same. Regardless of whether you re at work or at home, the experience should be the same. Whether you re on Windows or Linux, the experience should be the same. If you re on a desktop, a laptop, or a mobile device, the experience should be the same.

This is all that the view contains; if you open up the code-behind file, you ll see that there is no further glue tying this view together. Listing 4 3 proves this. Listing 4 3. Proof that the View Has the Most Basic of Code-Behind Files namespace MvvmWpfApp { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window {

When the value is committed to the source, WPF checks each validation rule, in order (Remember, a value in a text box is committed to the source when the text box loses focus, unless you specify otherwise with the UpdateSourceTrigger property) If all the validation succeeds, WPF then calls the converter (if one exists) and applies the value to the source..

Note If you add the PositivePriceRule followed by the ExceptionValidationRule, the PositivePriceRule will be

evaluated first. It will capture errors that result from an out-of-range value. However, the ExceptionValidationRule will catch type-casting errors that result if you type an entry that can t be cast to a decimal value (such as a sequence of letters).

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